(A) Downward sloping concave to the origin
(B) Downward sloping convex to the origin
(C) Downward sloping straight line to the origin
(D) All of the above
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(A) Downward sloping concave to the origin
(B) Downward sloping convex to the origin
(C) Downward sloping straight line to the origin
(D) All of the above